折射率\(n{=}\sqrt{2}\)的直角玻璃三棱镜截面如图所示，一条光线从\(AB\)面入射，人射角为\(i(\)图中末标出\(){,}{ab}\)为其折射光线，\(ab\)与\(AB\)寸面的夹角\(\theta{=}60^{{∘}}{.}\)则\(({  })\)